S&C Completes Steam Control Valve Actuator Retrofit

A Bulgarian company had a 230 MW steam turbine-driven
generator unit running at such a level that they lost their controller that had
run for 15 years and had outdated hardware that was no longer available on the
market. The unit had been down for two months when S&C was contacted to
replace the controller of the electromechanical steam control valve actuator.

S&C successfully transferred all algorithms to a newly
selected controller. This programming was challenging because of the drastically
different architecture, programming languages, and necessity to integrate the
new controller into the existing system.

In addition to programming the new controller, S&C
tested the existing electromechanical actuators manufactured by Exlar at the
corporate offices because the customer was unable to test them onsite. After
successfully completing testing, S&C sent the actuators back to the
customer for use.

The unit was successfully started up in just a
couple days and put into operation; the entire project took less than one month
from start to finish. The project also came in under budget and exceeded
customer expectations.

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